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Update postgres database properties in activiti source code

I have downloaded the latest activiti source code(5.21.0),by default the activiti will point to h2 database and I want to change that to postgres.I made changes in db.properties file in-order to point my database.When I restart the activiti-explorer still it's pointing to h2 db. I have added the dependency of postgres in activiti POM file as well. My db.properties file is as follow:
db=postgres
jdbc.driver=org.postgresql.Driver
jdbc.url=jdbc:postgresql://localhost:5432/activitiDB
jdbc.username=postgres
jdbc.password=password
Can anyone help me to sort it out.

Sagari , did you try modifying the activiti engine as well. There is a configuration file for the same which contains the datasource properties. This can be used as the alternative to the property file approach.
It is elaborated here :
http://www.activiti.org/userguide/
(Database configuration)
Also could you try mvn clean and try running again. May be it will help

How are you running Explorer? Did you do a build of the webapp to get the war.
If so, changing the db.properties is all that's needed indeed. Where did you put that file?
Also, there's no need to clone the source code, you can download the latest zip file from http://activiti.org/download.html, it contains the explorer war file already.

Cannot load net.sourceforge.jtds.jdbc.Driver in Tomcat

I see there are other similar questions, but none of them cover my exact situation.
I'm migrating an Eclipse based web service from FreeBSD 9.2 and Tomcat7 over to FreeBSD 10.0 and Tomcat8. I've deployed my .war on the new server and it runs, right up until it has to do a SQL access, where it fails with "cannot load net.sourceforge.jtds.jdbc.Driver". I'm not sure what's missing. We don't load a driver in lib, it's all bundled into the one .war file (which works fine on the old machine). I've searched the tomcat config files to see if there's any pointers that need to be set, but I'm coming up empty.

Download the jTDS driver from here. Copy it into the Tomcats lib folder. Are you sure you are not using JNDI to retreive the datasource? If thats not the case, its better to include app specific jars in your project and not on the server, to avoid version conflicts with other projects.

Download ojdbc6 or ojdbc14 (which one usefull for Tomcat8)
copy to apache-tomcat-(version) >> lib file.
And in eclipse add ojdbc in Build Path >> order & export.

even with ojdbc14.jar in Build Path, Class.forName("oracle.jdbc.driver.OracleDriver") gets ClassNotFoundException

I'm trying to make an servlets application with java and oracle10g and I've had it well so far until I need some specific values from some the database, for wich I have a DAO class that handles the connection for retrieving data. I have the following issue.
First off, I excecute a main() method in this class that is suposed to retrieve all entries in some table an print the name of each one in console. I works perfectly.
then I want to return an ArrayList of all those names in order to use them in the servlet. So I make a method just like the one in the main() with the only difference that instead of printing the names, I add each one to an ArrayList which is returned after closing the conection. Well, It gets ClassNotFoundException in the line Class.forName("oracle.jdbc.driver.OracleDriver")
If it helps, I'm guided with this tutorial to connect java applications to oracle databases.
Any help would be appreciated

Put ojdbc14.jar inside your war file at WEB-INF/lib/ directory. You can use ANT task to do this. If you are unfamiliar with ANT, you can just copy the jar file inside WEB-INF/lib/ directory under your project and just zip it using Windows explorer or WinZip or anything else that works for you. Then rename the .zip file to .war and deploy on Tomcat server.
If you want some quick fix just copy the ojdbc jar file to server/lib directory under tomcat and restart tomcat. It should work.
EDIT: refer the comment below. While personally I have not seen any unexpected behavior with JDBC drivers in web-app classloader, but, it is recommended to keep driver jars under Server lib.

Bringing a remote tomcat/mySQL server to localhost Mac

I have a website someone's developing for me on a VPS (Java, javascript, CSS, HTML) that I would like to run on my Macbook Pro.
He commits the source on Github, which I download with Sourcetree.
I have Tomcat 6 and MySQL running on the Macbook fine.
Can I bring the root folder, the mySQL db and an associated media folder over without creating a .war file to run it on tomcat on localhost by simply setting up the connections properly in datanucleus, or is it much more complicated than that?
Thanks in advance for your thoughts.

I know people who try to develop application directly in die Webapp Folder from Tomcat but that is not the right way.
At your place i'll do this:
clone the application locale on your mac
Use an IDE(eclipse/Netbeans/IntelliJ) to open the project
Build a local war file which you can deploy directly to your $CATALINA_HOME/webapp/
Do not forget the make all required mySQL settings (context.xml) and so on...

Yes, you can. But it is necessary to have compiled webapp.
Simply put root folder contents (your deployed application) to "/webapps/ROOT" and start tomcat by running script in "bin" folder.
Make sure that you properly configured database properties of your application.
If you have only sources - it is not such simple. You have to build war and deploy it. Or ask developer to include "target" directory in git repository and then copy "classes" folder to /webapps/ROOT/"

where are Oracle's DMS class files?

I'm running a JBoss server (inside Eclipse), with some Hibernate mixed in. I installed Oracle's ojdbc drivers from here:
Oracle Database 11g Release 2 JDBC Drivers
I specifically downloaded the file: ojdbc6dms_g.jar, which according to the site contains instrumentation to support DMS. However when I startup my AS server, I get the following:
Caused by: java.lang.ClassNotFoundException: oracle.dms.console.DMSConsole from [Module
"com.oracle:main" from local module loader #485fcf29 (roots: /usr/local/jboss-7.1.1-
final/modules)]
when the server is trying to get a new hibernate ejb exception.
I checked Oracle's jar file and sure enough it doesn't contain the class oracle.dms.console.DMSConsole, although from the notes on Oracle's site about the jar file, it seems like the jar file should contain the DMS classes.
Can anyone point me to the correct jar file? And when I do get the right file, where should this file be installed to, particularly with regards to Eclipse and JBoss?
Update: Just found another question asking the same thing here on SO.

The missing classes are indeed in dms.jar. But as I've seen asked elsewhere finding the dms.jar file is not easy. You won't find dms.jar at Oracle Database 11g Release 2 JDBC Drivers because as noted by Oracle: dms.jar is not shipped as part of the RDBMS product. It is only available as part of the Oracle Application Server product.
I hopped onto our server and grabbed the jar file from our Oracle installation directory. We have 11g installed. With 11g you should be able to find the file here:
$ORACLE_HOME/oc4j/lib/dms.jar

I got the same error for different reason and yes it was due to missing dms.jar file. I just had to find where dms.jar file was on our Oracle Application server (Release 12.2.3) and assigned it to the CLASSPATH. And it worked. Thanks for the pointing to the missing .jar file.
Out .jar file was in $ORACLE_HOME/lib/ folder. Changed the path value as :
CLASSPATH=$CLASSPATH:$ORACLE_HOME/lib/dms.jar and it started working.
Fyi..if it helps anyone i was trying to load BI/XML publisher DATA TEMPLATE using XDOLoader utility when i got this error.
-ppemavath

i too face this problem but when i removed all database related jars and added ojdbc6 (or ojdbc7) jar then application working fine. more details please see below link.
https://community.oracle.com/thread/2388722